circulation of water
71Caspian Sea — a salt lake between SE Europe and Asia: the largest inland body of water in the world. ab. 169,000 sq. mi. (438,000 sq. km); 85 ft. (26 m) below sea level. * * * Inland salt lake between Europe and Asia, bordering Azerbaijan, Russia, Kazakhstan,… …
72Rodeo Lagoon — is a coastal lagoon located in the Marin Headlands division of the Golden Gate National Recreation Area, which is in southern Marin County, California. [ [http://www.topozone.com/map.asp?lat=37.82893 lon= 122.53841 datum=nad83 u=4 layer=DRG… …
73Reef aquarium — See also: Marine aquarium Reef aquarium in Monaco A reef aquarium or reef tank is an marine aquarium that prominently displays live corals and other marine invertebrates as well as fish that play a role in maintaining the coral reef environment.… …
74groundwater — [groundwôt΄ər] n. water found underground in porous rock strata and soils, as in a spring: also written ground water * * * ground water also ground·wa·ter (groundʹwô tər, wŏt ər) n. Water beneath the earth s surface, often between saturated soil… …
75hydrologic cycle — the natural sequence through which water passes into the atmosphere as water vapor, precipitates to earth in liquid or solid form, and ultimately returns to the atmosphere through evaporation. [1955 60; HYDROLOG(Y) + IC] * * * Cycle that involves …
76hot spring — a thermal spring having water warmer than 98°F (37°C): the water is usually heated by emanation from or passage near hot or molten rock. Cf. warm spring. [1660 70] * * * or thermal spring Spring that issues water at temperatures substantially… …
77Vivarium — A vivarium (Latin, literally for place of life; plural: vivaria or vivariums ) is an area, usually enclosed, for keeping and raising animals or plants for observation or research. Often, a portion of the ecosystem for a particular species is… …
78Deep sand bed — A deep sand bed is[1] a filtration method used in some saltwater aquariums. A deep sand bed, similar to the Berlin Method, is designed to cultivate anaerobic bacteria in the bottom layers of sand, converting nitrate to nitrogen gas to remove… …
79Perkins, Jacob — born July 9, 1766, Newburyport, Mass., U.S. died July 30, 1849, London, Eng. U.S. inventor. He built a machine to cut and head nails in one operation с 1790. He developed a method of engraving paper money that made counterfeiting difficult; lack… …
80aquarium — aquarial, adj. /euh kwair ee euhm/, n., pl. aquariums, aquaria /euh kwair ee euh/. 1. a glass sided tank, bowl, or the like, in which fish or other living aquatic animals or plants are kept. 2. a building or institution in which fish or other… …
